Cooling device for internal combustion engines



March 22, 1932. Q' $|MMEN 1,850,245

COOLING DEVICE FOR INTERNAL COMBUSTION ENGINES Filed Aug. 18, 1951 Patented Mar. 22, 1932 UNITED STATES- PATENT OFFICE.

OSCAR SIMMEN, OF

ERLACH, SWITZERLAND, .ASSIGNOR TO SULZER FRERES SOGIETE ANONYME, OF WINTERTI-IUR, SWITZERLAND COOLING DEVICE FOR INTERNAL COMBUSTION ENGINES Application filed August 18,1931, Serial No. 557,802, and in Switzerland August 28, 1930.

This invention relates to internal combustion engines of the liquid fuel injection type in which the main quantity of the cooling medium for the cylinders and cylinder heads passes through a closed circuit and only a part of this medium is discharged through branch pipes provided with open outlets.

According to the present invention the cooling medium flowing through the branch pipes is employed to cool fuel injection devices prior to its being discharged through the open end of its associated branch pipe.

One construction according to this invention is illustrated somewhat diagrammatically byway of example in the accompanying drawings, in which Figure 1 is a section through the cylinder and frame of an internal combustion engine, and

Figure 2 is a plan of the arrangement illustrated in Figure 1 as applied to a. sixcylinder internal combustion engine. 1

In the construction illustrated the engine comprises a frame 1, resting upon a base plate or bed 2 and carrying a cylinder 3 provided with a cylinder head 4 in which is arranged a fuel injection valve 5 having a chamber therein through which cooling medium can be circulated. Carried by bearings in the bed 2 is a crank-shaft 6 which is connected to a piston 7 by a connecting rod 10 having a crosshead 9 and a piston rod 8.

The cooling medium is conveyed to the cooling jacket 12 of each cylinder from the pipe 11 and flows thence through a pipe 13 into the cooling chamber 14 of the cylinder head 4:. Part of the cooling medium escapes from the cooling chamber 14 of the cylinder head 4 by way of a pipe 15 into a common collecting pipe 16 while another part of this cooling medium is conveyed through a pipe 19 into the cooling chamber of the fuel injection device 5 whence it flows by way of a pipe 17.

Each of the several pipes 17 from the cooling chamber of the various fuel injection devices is provided with an open outlet 20 discharging into a collecting trough 18-so that the'flow of cooling medium from the cooling chamber of each fuel injection device 5 through its pipe 17 can be observed, means chambers of the cylinder and cylinder head.

It is to be understood that if desired the cooling medium delivered to the cooling chambers of the valves may be derived directly from the cooling chambersof the cylinders or of the crosshead guides where cooled crosshead guides are employed.

I claim:

In an internal combustion engine, in combination a plurality of cylinders, a piston reciprocating in each of said cylinders, a cooling'jacket surrounding each of said cylinders, a pipe connected to the lower end of each of said cooling jackets for conveying cooling liquid to said jackets, a cylinder head carried by each of said cylinders surrounded by a cooling space, a passage connecting each of said cooling spaces with said jacket of the corresponding cylinder, a fuel injection valve arranged in each of said cylinder heads, a chamber in each of said valves, a pipe connecting the cooling space of each cylinder head to said chamber in the corresponding valve, a pipe having an open outlet leading from each of said chambers. and a trough common to all said open ended pipes.

In testimony whereof I have afiixed my signature.

OSCAR SIMMEN. 

